Note 1 - Significant Accounting Policies - Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2022	May 01, 2021	May 02, 2020
Balance at beginning of year	$ 1,140	$ 1,350	$ 516
Net (credit) charge to expense	(581)	(138)	893
Net charge-off	0	(72)	(59)
Balance at end of year	$ 559	$ 1,140	$ 1,350